It took me some time to see that the number on the upper left was light sensitive but once I got it it was a fun game! Is there a maximum to reach ? Right now it feels like you can farm the light to go through all the levels, maybe that was your intent, but I think you can push this mechanic further if you keep working on it. Anyways it is a great game, well done ! (Also it is a great use of the theme, the first game I see that exploits fear over invincibility !)